Threshold behavior of Feynman diagrams: the master two-loop propagator
Abstract
An asymptotic expansion of the two-loop two-point ``master'' diagram with two masses m and M, on the mass shell Q2=M2, is presented. The treatment of the non-analytical terms arising in the expansion around the branching point is discussed. Some details of the calculation of a new class of two-loop integrals are given.
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